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Reconfigurable band notch butterfly-wing shaped ultra-wide band antenna using varactor diodes

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Abstract

In this paper, a CPW fed UWB planar monopole Butterfly’s-wing shaped antenna with reconfigurable band notch characteristics is presented, tested and fabricated in the beginning three eelliptical patches are used to construct the antenna, then three elliptical slots have been created to improve the performance of the antenna. By using suitable varactor diodes in suitable positions in the slots a notch frequency can be obtained. The notch frequency of the antenna can be controlled by varying the varactor diodes’ capacitance that varied from 0.2 to 1.4 pf and frequency tunability can be achieved without modifying the basic antenna geometry. The proposed antenna is suitable for downlink band notching applications in C-band satellite (3.6–4.2 GHz). Finite element method FEM is used to simulate the proposed structures using HFSS. A prototype of the proposed antenna using three capacitor elements is fabricated and S11 is measured. Three 0.5 pf single capacitor element are used instead of the varactor diodes which are not available in the laboratory and the measured S11 is compared with the simulated results. Very good agreement has been obtained between them. The proposed antenna without and with capacitors yield directive patterns in the E-plane and omnidirectional patterns in H-plane. Also the gain is suppressed in the notch frequency.

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Authors and Affiliations

  1. Department of Electronics and Electrical Communication Engineering, Faculty of Electronic Engineering, Menoufia University, Menouf, 32952, Egypt

    Ahmed S. Elkorany & Ghidaa T. Ahmed

  2. High Institute of Electronic Engineering, Ministry of Higher Education and Scientific Research, Belbeis, Elsharkia, Egypt

    Ahmed S. Elkorany

  3. Electronics Research Institute, Cairo, Egypt

    Hesham A. Mohamed

  4. Engineering Department, Nuclear Research Centre, Atomic Energy Authority, Cairo, Egypt

    Zeinab F. Elsharkawy

Authors
  1. Ahmed S. Elkorany
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  2. Ghidaa T. Ahmed
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  3. Hesham A. Mohamed
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  4. Zeinab F. Elsharkawy
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Correspondence to Zeinab F. Elsharkawy.

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Elkorany, A.S., Ahmed, G.T., Mohamed, H.A. et al. Reconfigurable band notch butterfly-wing shaped ultra-wide band antenna using varactor diodes. Microsyst Technol 27, 2695–2703 (2021). https://doi.org/10.1007/s00542-020-05003-4

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  • DOI: https://doi.org/10.1007/s00542-020-05003-4

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